 If you put in a four-prong, you won't only have a hot, a hot, and a ground, and you won't have a neutral, and your new dryer needs a neutral. Right. That means you're putting the ground on the neutral, and you're not supposed to do that. Right. That's what I didn't want to change out from. Well, the house we own did have a dryer inside the location, and it had been working for the last 10 years when we brought the home in.